Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Share capital - Disclosure of number and weighted average exercise prices of share options (Details)

v3.19.1
Share capital - Disclosure of number and weighted average exercise prices of share options (Details)
$ / shares in Thousands, $ in Thousands
 12 Months Ended
May 02, 2016
USD ($)
Dec. 31, 2018
CAD ($)
$ / shares
shares
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Reconciliation of stock options outstanding [Abstract]          
Outstanding – Beginning of year (in shares)       4,864,000 4,052,000
Granted pursuant to Stock Option Plan (in shares) | shares       3,003,000 2,729,000
Granted pursuant to Section 613(c) of TSX manual (in shares) 200        
Exercised (in shares) | shares       (276,000) (1,494,000)
Forfeited (in shares) | shares       0 (423,000)
Outstanding – End of year (in shares)   7,427   7,591,000 4,864,000
Options exercisable – End of year (in shares) | shares   4,510,000 4,510,000 4,510,000 2,834,000
Reconciliation of weighted average excercise price, stock options [Abstract]          
Weighted average exercise price of share options outstanding in share-based payment arrangement, opening balance (in dollars per share)     $ 4.80   $ 3.74
Weighted average exercise price of share options granted in share-based payment arrangement (in dollars per share)     6.54   5.44
Weighted average exercise price of share options exercised in share-based payment arrangement (in dollars per share)     4.40   3.42
Weighted average exercise price of share options forfeited in share-based payment arrangement (in dollars per share)     0.00   3.54
Weighted average exercise price of share options outstanding in share-based payment arrangement, closing balance (in dollars per share)     5.51   4.80
Weighted average exercise price of share options exercisable in share-based payment arrangement   $ 5.03 $ 5.03 $ 5.03 $ 4.25